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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1003-1010
© 1985

Article

Effect of Oxygen on Photosynthetic 14CO2 Fixation in Chroomonas sp. (Cryptophyta) III

Effect of Oxygen on Photosynthetic Carbon Metabolism

Kensaku Suzuki and Tomoyoshi Ikawa

Institute of Biological Sciences, University of Tsukuba Sakura-mura, Ibaraki 305, Japan

Photosynthetic carbon metabolism was studied with Chroomonas sp. cells in which the rate of photosynthesis was inhibited under both an anaerobic condition and high concentrations of oxygen. The time course of 14C-incorporation into photosynthetic products showed that 3-phosphoglycerate was the initial product of photosynthetic CO2 fixation in Chroomonas sp. cells. During 5-min photosynthesis, a considerable amount of 14C was incorporated into the insoluble fraction (mostly cryptomonad starch), and oxygen predominantly affected 14C-incorporation into this fraction. Although 14C-incorporation into intermediates of the photorespiratory pathway increased with increasing O2 concentration, the amounts were much less than expected from the degree of oxygen inhibition. It is noteworthy that 14C-dihydroxyacetone phosphate accumulated during photosynthesis only under the anaerobic condition, whereas the levels of the other phosphate esters were scarcely affected by the oxygen concentration.

Ribulose-1,5-bisphosphate carboxylase from Chroomonas sp. was competitively inhibited by oxygen, and its Km(CO2) value was similar to those of terrestrial C3 plant enzymes.

(Received November 19, 1984; Accepted May 20, 1985)
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